You need to use thick VM disks on Gluster, which is the default behavior for a long time.
Also, check all bricks' free space. Most probably you are out of space on one of the bricks (term for server + mountpoint combination).

Best Regards,
Strahil Nikolov

On Wed, Jun 9, 2021 at 12:41, José Ferradeira via Users
<users@ovirt.org> wrote:
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